How to create Mat from file bytes

Question

I notice that Highgui.imread("h:/opencv.jpg") will automatically create the Mat instance with the correct type through auto-detection regardless of the file extensions.

Now what i have is a byte array uploaded from network.
Is it possible to create the correct Mat object without having to manually construct it with the row, col and type ?
I think this should be doable since imread can read the file bytes and detect the type, why not with the file bytes that i can pass ?

Answer 1

if your bytes are actual pixels :

Mat m = new Mat(h,w,type);
m.put(0,0,bytes);

if it is an encoded image (like 'on-disk'), headers and all:

Mat m = Highgui.imdecode(new MatOfBytes(bytes), 1);

docs